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Support creating external snapshots with QCOW2v3 features.

Currently, libvirt creates inactive external snapshots by calling qemu-img, for active (live) external snapshots it uses the blockdev-snapshot-sync QMP command and lets QEMU create them.

For inactive snapshots, libvirt only needs to supply the requested features (and compat level) to qemu-img on the command line.

For active snapshots, libvirt will have to create the file and use 'mode': 'existing' parameter of blockdev-snapshot-sync.

https://www.redhat.com/archives/libvir-list/2013-June/msg00846.html
https://www.redhat.com/archives/libvir-list/2013-June/msg00867.html

Upstream patches:
https://www.redhat.com/archives/libvir-list/2015-April/msg00392.html